New Focus seems to drink it, then magic petrol out of thin air.

Are they really that bad? That would make them no improvement MPG-wise on the 1.6 they replaced.

No they aren't and whoever has one that isn't getting good mpg is driving it incorrectly. Yes the mpg won't achieve the stated figures, but that is true for the majority of manufacturers. Audi recently were taken to task by the advertising standards for making unreasonable claims over the mpg of one of its vehicles.
As we have a 100ps 1.0 ecoboost fiesta I think that getting 58mpg at a steady 80-85mph is very good.
Then of course you have the fact that they're much more fun to drive than the 1.6 versions were...
 
No, actually it isn't that bad at all and has more torque than the 1.6 the ecoboost replaces thus the midrange urge is better...
 
I had the displeasure of doing over 2000kms in a Focus 1.0T over Christmas.

Credit where credit's due, for a 1.0 it's absolutely amazing.

My findings:
40MPG @ 80MPH
30MPG @ 90MPH
23.5MPG @ 100MPH

I think I averaged around 30MPG over the 2000kms, which were 95% autobahn.
 
Interesting how manufacturers are gravitating towards small turbo engines because they do well on the NEDC.

VAG's 1.2 tsis doing a bit better on fuelbut still falling well short of NEDC.
http://www.honestjohn.co.uk/realmpg/skoda/rapid-2012/12-tsi-105ps
http://www.honestjohn.co.uk/realmpg/skoda/octavia-2013/12-tsi

But then Honda's 1.4 NA engine in the Civic doing just as well real world:
http://www.honestjohn.co.uk/realmpg/honda/civic-2012/14-i-vtec

Edit: it would be interesting to see a 1.0 Ecoboost in the hands of a competitive hypermiler. I suspect, with Pulse and Glide, Drive with Load etc it could do very well. But to be fair - if you consistently used those techniques on british roads, you'd be an utter menace.
 
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Did you find that the digital 'miles left' on the screen behind the wheel went down fairly quick? And then gained miles while it was parked up with the engine off?

What were you getting round the streets?
 
fuel trip computers are evil, do it the old school way.

My CRZ said I had 20 miles left once, around 4 actual miles later, the trip showed 0 miles remaining.

Cue much butt-clenching as I coasted to the petrol station on what I thought was "zero petrol" left.
 
As noted, It'll be based on most recent driving style and time, which way the wind is blowing and how the stars are aligned.

It's only a rough best estimate at the end of the day, there's far too many parameters that influence it, especially in city driving.
 
fuel trip computers are evil, do it the old school way.

My CRZ said I had 20 miles left once, around 4 actual miles later, the trip showed 0 miles remaining.

Cue much butt-clenching as I coasted to the petrol station on what I thought was "zero petrol" left.

I've been 20 miles past zero in my 2010 Insight and I could still only fit just over 36 litres into a 40 litre tank. Also topped off a loan Jazz with £5 four times (only had it 3 days - garage gave it me nearly empty and I just wanted to get rid of the fuel light) before it suddenly noticed and the fuel gague shot up to over half. The range on Honda trip-computers is terribly over conservative and below 1/4 of a tank it's calculated by the ECU rather than measured by a fuel float.
 
Spoke to a lad in the Ford garage today who said his 1.0 Focus does the same and it's best to just look at the needle or you end up getting obsessed with the MPG and can forget about road hazards.

Tonights trip back was a world record. I set off from work with 92 miles, got back and the gauge said 63 miles. Went in the house, had a brew, and got back in the car. Started her up, and it said 89 miles. 3 miles worth of juice to drive 13 miles?

So has it -

Remembered the motorway drive back tonight was a smooth one and is saying there are 89 miles left of motorway driving?
If it thought this, why didn't it go back up to 88 when I got off the motorway?
Has the float somehow displaced when the car is at rest (my drive is flat btw)?
Or do I just go with the needle because this whole thing is doing my nut in?!
 
Or do I just go with the needle because this whole thing is doing my nut in?!

This TBH. The range indicator can be swayed one way or another so much from driving style that it often renders it pointless. On my trip home from fighting my way out of town to the end of a 7.5 mile follow the leader at a maximum of 50mph I can gain 50+ miles on the range to empty.
 
Spoke to a lad in the Ford garage today who said his 1.0 Focus does the same and it's best to just look at the needle or you end up getting obsessed with the MPG and can forget about road hazards.

Tonights trip back was a world record. I set off from work with 92 miles, got back and the gauge said 63 miles. Went in the house, had a brew, and got back in the car. Started her up, and it said 89 miles. 3 miles worth of juice to drive 13 miles?

So has it -

Remembered the motorway drive back tonight was a smooth one and is saying there are 89 miles left of motorway driving?
If it thought this, why didn't it go back up to 88 when I got off the motorway?
Has the float somehow displaced when the car is at rest (my drive is flat btw)?
Or do I just go with the needle because this whole thing is doing my nut in?!

Option five.

On your drive back it was using a range estimate that started with your long-term average mpg over the tank and moved on to your journey average mpg. Then when you got back into the car it had forgotten your journey average mpg and moved back to your tank average mpg.
At a guess :)
 
I've been 20 miles past zero in my 2010 Insight and I could still only fit just over 36 litres into a 40 litre tank. Also topped off a loan Jazz with £5 four times (only had it 3 days - garage gave it me nearly empty and I just wanted to get rid of the fuel light) before it suddenly noticed and the fuel gague shot up to over half. The range on Honda trip-computers is terribly over conservative and below 1/4 of a tank it's calculated by the ECU rather than measured by a fuel float.

I guess it is better to be over conservative.

yeah I don't think I've ever put over 36 litres into my tank, 40 litre tank here too.
 
As has probably already been said, Don't pay much attention to the Trip computer, My 1.6TDI Fabia said i was getting 39MPG's but on actually fill for fill it worked out at 51MPG, I pay no attention to the trip computer anymore.
 
I have a 2012 1.6 150PS Ecoboost and after about 4000 miles (got it with 12.5k on it) I have averaged 33.5 MPG and 20 MPH. I do a 20 mile round trip to work 2-3 days a week which is lots of stop start and takes about 45-60 minutes each way and then do the odd 50-200+ mile round trip on motorways where I usually drive at 60-70 as I am not in a rush.

I have never noticed an issue with the miles remaining counter on mine.
 
If you don't want to work it out by hand, use Fuelly. It does it all for you, you just input your price per L, and the volume of fuel you added, and mileage details and it works it out for you. Even plots graphs over time so you can see how your vehicle is improving or not.
 
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